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 		<title>属性选择器使用56</title>
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		<h1 class="main-title">林徽因诗集</h1>
		<p class="main top">你是人间四月天</p>
		<p class="text_main">我说你是人间的四月天;笑音点亮了四面风……</p>
		<p class="mainBottom">你是人间四月天</p>
	</body>
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